Question

they know the cause of his success
(change into complex )​

Answer 1

Answer:

The causes of his success is known by them

Answer 2

Explanation:

Question:-

They know the cause of his success. (Change into complex sentence)

Answer:-

They have always known the cause of his success.

Reason:-

To change a sentence into complex sentence, we have to:-

• Phrases and clauses can be added.

• Two simple sentences can be joined to make a complex sentence.

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Hope it helps you...

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